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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14daa69219f3dfadb451ec3055ad848ad6fd7712aa356bca0e6f0a514a8ab834' 
  AND token = 'gW6/a4wU2MIcBYMHG0GMBEbpjU4fSOzi7Nq86tXzv0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}